8a461d940c
suggest adding a where-clause when there is an unmet trait-bound that can be satisfied if some type can implement it.
59 lines
2.4 KiB
Rust
59 lines
2.4 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Test that the unboxed closure sugar can be used with an arbitrary
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// struct type and that it is equivalent to the same syntax using
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// angle brackets. This test covers only simple types and in
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// particular doesn't test bound regions.
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#![feature(unboxed_closures)]
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#![allow(dead_code)]
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trait Foo<T> {
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type Output;
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fn dummy(&self, t: T, u: Self::Output);
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}
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trait Eq<X: ?Sized> { }
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impl<X: ?Sized> Eq<X> for X { }
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fn eq<A: ?Sized,B: ?Sized +Eq<A>>() { }
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fn test<'a,'b>() {
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// No errors expected:
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eq::< Foo<(),Output=()>, Foo() >();
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eq::< Foo<(isize,),Output=()>, Foo(isize) >();
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eq::< Foo<(isize,usize),Output=()>, Foo(isize,usize) >();
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eq::< Foo<(isize,usize),Output=usize>, Foo(isize,usize) -> usize >();
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eq::< Foo<(&'a isize,&'b usize),Output=usize>, Foo(&'a isize,&'b usize) -> usize >();
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// Test that anonymous regions in `()` form are equivalent
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// to fresh bound regions, and that we can intermingle
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// named and anonymous as we choose:
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eq::< for<'x,'y> Foo<(&'x isize,&'y usize),Output=usize>,
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for<'x,'y> Foo(&'x isize,&'y usize) -> usize >();
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eq::< for<'x,'y> Foo<(&'x isize,&'y usize),Output=usize>,
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for<'x> Foo(&'x isize,&usize) -> usize >();
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eq::< for<'x,'y> Foo<(&'x isize,&'y usize),Output=usize>,
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for<'y> Foo(&isize,&'y usize) -> usize >();
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eq::< for<'x,'y> Foo<(&'x isize,&'y usize),Output=usize>,
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Foo(&isize,&usize) -> usize >();
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// lifetime elision
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eq::< for<'x> Foo<(&'x isize,), Output=&'x isize>,
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Foo(&isize) -> &isize >();
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// Errors expected:
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eq::< Foo<(),Output=()>,
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Foo(char) >();
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//~^^ ERROR E0277
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}
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fn main() { }
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